Test if two double-precision floating-point numbers are the same value.
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> Test if two double-precision floating-point numbers are the same value.
``bash`
npm install @stdlib/number-float64-base-assert-is-same-value
`javascript`
var isSameValue = require( '@stdlib/number-float64-base-assert-is-same-value' );
#### isSameValue( a, b )
Tests if two double-precision floating-point numbers a and b are the same value.
`javascript
var bool = isSameValue( 3.14, 3.14 );
// returns true
bool = isSameValue( 5.0, 3.0 );
// returns false
`
In contrast to the strict equality operator ===, the function distinguishes between +0 and -0 and treats NaNs as the same value.
`javascript
var bool = ( 0.0 === -0.0 );
// returns true
bool = isSameValue( 0.0, -0.0 );
// returns false
bool = isSameValue( -0.0, -0.0 );
// returns true
bool = ( NaN === NaN );
// returns false
bool = isSameValue( NaN, NaN );
// returns true
`
- The function implements the [SameValue Algorithm][ecma-262-same-value-algorithm] as specified in ECMAScript 5.
`javascript
var isSameValue = require( '@stdlib/number-float64-base-assert-is-same-value' );
var bool = isSameValue( 3.14, 3.14 );
// returns true
bool = isSameValue( 0.0, 0.0 );
// returns true
bool = isSameValue( -0.0, 0.0 );
// returns false
bool = isSameValue( NaN, NaN );
// returns true
`
*
`c`
#include "stdlib/number/float64/base/assert/is_same_value.h"
#### stdlib_base_float64_is_same_value( a, b )
Tests if two double-precision floating-point numbers a and b are the same value.
`c
#include
bool v = stdlib_base_float64_is_same_value( 3.14, 3.14 );
// returns true
v = stdlib_base_float64_is_same_value( 0.0, -0.0 );
// returns false
`
The function accepts the following arguments:
- a: [in] double first input value.[in] double
- b: second input value.
`c`
bool stdlib_base_float64_is_same_value( const double a, const double b );
`c
#include "stdlib/number/float64/base/assert/is_same_value.h"
#include
#include
int main( void ) {
const double a[] = {
5.0,
-2.0,
0.0,
0.0/0.0
};
const double b[] = {
5.0,
2.0,
-0.0,
0.0/0.0
};
bool v;
int i;
for ( i = 0; i < 4; i++ ) {
v = stdlib_base_float64_is_same_value( a[ i ], b[ i ] );
printf( "Same value? %s\n", ( v ) ? "True" : "False" );
}
}
`
*
This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
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---
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[ecma-262-same-value-algorithm]: http://ecma-international.org/ecma-262/5.1/#sec-9.12